Textile chrome-printing compositions and a process for their manufacture



integral atom ratios.

Patented Nov. 23, 1948 TEXTILE CHROME-PRINTING COMPOSI- TIONS AND A PROCESS FOR THEIR MANU- FACTURE Charles Babey, Willi Thommen,

and Emil Stocker, Basel, Switzerland, assignors to J. B. Geigy A.-G., Basel, Switzerland, a Swiss firm No Drawing. Application June 30, 1945, Serial No. 602,678. In Switzerland July 28, 194.4

12 Claims. 1

It is a known fact that textile printing colors containing, beside chroming dyestuffs, gum of vegetable origin, 1. e., natural gum such as gumarabic and decomposed natural gum, so-called commercial gum, crystal gum, etc., and alkali chromate or ammonium chromate or bichromate respectively yield in the finished prints a certain hardening.

We have now found that this disadvantage can be avoided by adding to chromate-containing textile printing colors of usual composition compounds of metals which yield in an aqueous solution, colorless, dior trivalent cations and do not form insoluble salts with chromates. On the other hand, it is also possible to previously combine these metals and chromates or bichromates respectively by causing chromic acid or alkali- I or ammonium-chromate or bichromate respectively to react with suitable compounds of the defined dior trivalent metals. For this purpose it is not necessary to isolate the reaction products, as the resulting solutions may be used directly; of course, it is also possible to evaporate the resulting solution to dryness or, as far as the solubility conditions allow such a procedure, to isolate the metal chromates in any other way.

By the expression metal chromates may be understood the simple chromates as well as chromates containing more than one cationic component.

131- or trivalent metals falling within the scope of the above definition for technical purposes are particularly zinc, cadmium, magnesium, calcium, strontium, aluminium, etc.

It is not necessary to use the components in An appropriate atom ratio of chromium to dior trivalent metalseems to be that of about 3:2, although it can widely diiier from these values. Moreover, it is advantageous to neutralize the acid reaction which may result when combining the metal compound and the chromate, by means of a base like ammonia, al-

, kali hydroxides, alkali carbonates and so on.

For the determination of the required quantity of chromium compound, the chromium requirement of the respective dyestufi and the chromium content of the preparation are decisive.

The following exampleswill now illustrate, but not limit the object of the present invention, the parts being by weight, unless otherwise stated.

Example 1 30 parts of sodium bichromate are dissolved in '75 parts of water, then 41 parts of zinc sulfate are dissolved in 45 parts of water and both the obtained solutions are combined and treated while stirring with 26 parts of 25% ammonia. The resulting precipitate is filtered, washed with some cold Water and dried at -'70 C. The yellow powder contains about 25% chromium, the atom ratio of CrzZnzNI-Ia being almost 312:2.

The chromium-containing filtrate may be used for further portions to be treated.

The obtained preparation can be used for instance in the following printing color:

Grams Chromazurol S concentrated (Color Index No. 723; lst edition) 2 Urea 8 Water 2'? Commercial gum 1:3 60 acetic acid 3 To this paste 2 grams of the zinc chromate made according to the above example are added. Artificial silk or natural silk printed with this color possess after steaming, washin and drying Instead of ammonia, also ethanolamine may be used in this example.

Example 2 3 parts of sodium bichromate are mixed with 3.9 parts of zinc sulfate, wetted with 3 partsby volume of a concentrated ammonia solution and the whole is dried on the water-bath. The powder gives also very good results, when applied in the above printing color.

Similar results are obtained with the following preparations:

(a) 3 parts of sodium bichromate are dissolved in 18 parts of water and treated with a solution of 3.9 parts of zinc sulfate in 12 parts of water. To the resulting mixture are then added 3 parts of 30% caustic soda or potash lye, the whole being Well stirred and finally dried on the waterbath.

(1)) To a solution of 3 parts of sodium bichromate in 18 parts of water is added a solution of 3.3 parts of magnesium sulfate in 12 parts of water as Well as 3.2 parts of a 25% ammonia solution. The obtained solution can be used directly as additional product to any suitable printing color.

(0) 3 parts of sodium bichromate are mixed with 2.2 parts of anhydrous calcium chloride and dried at C.

(d) A solution of 3 parts of sodium bichromate and 18 parts of water is treated with a solution of 5.1 parts of cadmium sulfate in 20 parts of water, then 9 parts by volume of concentrated ammonia are added and the Whole is evaporated to dryness. Instead of cadmium sulfate, a solution of 3.5 parts of strontium chloride may also be used.

(c) To a solution of 3 parts of sodium bichromate in 18 parts of Water are added 6.7 parts by volume of an aluminium sulfate solution containing per liter 333 parts of aluminium sulfate. ihen 15 parts by volume of a concentrated ammonia solution are added. The resulting preparation can be used directly.

What we claim is:

1. Process for the manufacture of textile chrome-printing pastes containing hexavalent chromium, chromable dyestuff and gum of vegetable origin, comprising adding to a printing composition Which contains chromable dyestuff and gum of vegetable origin water-soluble chromates containing at least one metal forming colorless cation selected from the group consisting of diand trivalent cations.

2. Process for the manufacture of textile chrome-printing pastes containing hexavalent chromium, chromable dyestuff and gum of vegetable origin, comprising adding to a printing composition which contains chromable dyestufi and gum of vegetable origin a Water-soluble chromate containing zinc.

3. Process for the manufacture of textile chrome-printing pastes containin hexavalent chromium, chromable dyestufi and gum of Vegetable origin, comprising adding a Water-soluble chromate containing magnesium to a printing composition which contains chromable dyestuflf and gum of vegetable origin.

4. Process for the manufacture of textile chrome-printing pastes containing hexavalent chromium, chromable dyestuff and gum of vegetable origin, comprising adding to a printin composition Which constains chromable dyestufi and gum of vegetable origin a water-soluble chromate obtained by reacting alkali-bichromate with zinc sulfate and ammonia.

5. Process for the manufacture of textile chrome-printing pastes containing hexavalent chromium, chromable dyestuff and gum of vegetable origin, comprising adding to a printing composition Which contains chromable dyestuff and gum of vegetable origin a Water-solub1e chromate i obtained by reacting alkali-b-ichromate with zinc sulfate and alkali hydroxide.

6. Process for the manufacture of textile chrome-printing pastes containing hexavalent chromium, chromable dyestuff and gum of vegetable origin, comprising adding to a printing composition which contains chromable dyestufi and gum of vegetable origin a water-soluble chromate obtained by reacting alkali-bichromate with magnesium sulfate and ammonia.

7. A textile chrome-printing composition comprising, beside chromable dyestufi and gum, a water-soluble chromate containing at least one metal-formin colorless cation selected from the group consisting of diand tri-valent cations.

8. A textile chrome-printing composition comprising, beside chromable dyestuif and gum of vegetable origin, a water-soluble chromate containing zinc.

9. A textile chrome-printing composition comprising, beside chromable dyestufi and gum of vegetable origin, a Water-soluble chromate containing magnesium.

10. A textile chrome-printing composition containing, beside chromable dyestuif and gum of vegetable origin, a water-soluble chromate containing as cations zinc and ammonium.

11. A textile chrome-printing composition containing, beside chromable dyestufi and gum of vegetable origin, a Water-soluble chromate containing as cations zinc and sodium.

12. A textile chrome-printing composition containing, beside chromable dyestuff and gum of vegetable origin, a Water-soluble chromate containing as cations magnesium and ammonium.

CHARLES BABEY. WILLI THOMMEN. EMIL STOCKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 941,399 Winslow Nov. 30, 1909 1,426,299 Kunert Aug. 15, 1922 1,848,589 Werdenberg Mar. 8, 1932 1,942,774 Roulet Jan. 9, 1934 FOREIGN PATENTS Number Country Date 9,651 Great Britain 1908 188,632 Great Britain May 24, 1923 OTHER REFERENCES Textile Printing, by Knecht and Fothergill, third edition, 1936; Grifiin Co., London, pages 222, 223. v

American Dyestuff Reporter for Nov. 16, 1936, page 613 (Hutchins article) 

